Change the flow of your Amsterdam Standard and Expert Series acrylics or acrylic ink by adding Amsterdam pouring medium. 
This medium is specifically developed to be self-leveling and increases the flexibility of the paint film to prevent cracking. Depending on the desired flow, you can adjust the mixing ratio to your liking.
Amsterdam pouring medium:
Milky white when wet, dries colourless and transparent.
Shake well before use.
Affects the degree of gloss.
Self-leveling.
Does not affect the drying time of the paint.
Increases the flexibility of the paint film.
Can be thinned with a small amount of water.
Waterproof when dry.
Clean utensils with water.
Apply at temperatures above 10° C and store free of frost.